13=7+1/2X

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Solution for 13=7+1/2X equation: 


X in (-oo:+oo)

13 = (1/2)*X+7 // - (1/2)*X+7

13-((1/2)*X)-7 = 0

(-1/2)*X-7+13 = 0

6-1/2*X = 0 // - 6

-1/2*X = -6 // : -1/2

X = -6/(-1/2)

X = 12

X = 12

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